grains是minion第一次启动的时候采集的静态数据，可以用在salt的模块和其他组件中。其实grains在每次的minion启动（重启）的时候都会采集，即向master汇报一次的
/etc/salt/minion # 优先级最高
grains:
OS:
- Xen
- 1.1.1.1
http: nginx
/etc/salt/grains # 优先级次之
OS:
- Xen
- 1.1.1.1
http: nginx
/srv/salt/_grains/ # 优先级最低
xxx.py
salt ‘*‘ sys.list_functions grains
salt ‘*‘ grains.items
salt ‘*‘ grains.ls
salt ‘*‘ grains.get ipv4
salt ‘*‘ grains.item os ipv4
cat /srv/pillar/top.sls
base:
‘*‘:
- packages
- kkk
cat /srv/pillar/packages.sls
{% if grains[‘os‘] == ‘RedHat‘ %}
apache: httpd
{% elif grains[‘os‘] == ‘CentOS‘ %}
apache: apache2
{% endif %}
cat /srv/salt/_grains/sys_base.py
省略...
grains[‘npus‘] = __pillar__[‘apache‘]
省略...
原文：http://www.cnblogs.com/hanqian/p/6790101.html